(b) she must reduce her blood testosterone level to below five (5) nmol/L for a continuous period of at least six months (e.g., by use of hormonal contraceptives); and (c) thereafter she must maintain her blood testosterone level below five (5) nmol/L continuously (ie: whether she is in competition or out of competition) for so long as she wishes to remain eligible. This seems such a weird and arbitrary determination. So a male record-holder could legally become female or intersex, artificially lower his/her testosterone levels, and sweep? It's doping in the other direction. XY/XX is so simple. It's what causes testosterone differences.(a) she must be recognised at law either as female or as intersex (or equivalent);
If we use chromosomes, what about a person who was born intersex, and does not have a distinct XX or XY? Born XY? Sure, rule them out. Born with an indeterminate sex? Testosterone levels must be sufficiently low. Besides, Could such a person sweep after lowering their testosterone levels for a continuous period of six months or longer? I'm not so sure. At an elite level I'd think that would make an enormous difference.